SOi Digital vs Duct Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SOi Digital
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Mediante esta App mejorarás tu comunicación con el laboratorio SOi Digital Dental mediante el intercambio de imágenes, trabajos, facturas, etc. Pídele una cuenta de acceso a tu laboratorio SOi Digital.
Duct Calculator
This professional HVAC utility assists engineers and technicians with precise duct sizing and airflow calculations for ventilation systems. It simplifies essential calculations for both design and installation work, improving on-site efficiency.
- Calculate duct sizes using airflow (CFM) and velocity (FPM)
- Supports rectangular and round duct sizing in inches
- Determine air flow rate in CFM
- Calculate air velocity in FPM
- Simple interface for fast on-site calculations
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Duct Calculator is a focused duct sizing tool for HVAC engineers, designers and installation technicians. Enter what you know and get the duct dimensions, airflow or air velocity you need, without a chart or a slide rule. CALCULATIONS - Duct size: find the required duct dimensions from airflow (CFM) and air velocity (FPM). - Airflow: determine the airflow rate in CFM. - Air velocity: determine velocity in FPM to help verify system performance. DUCT SHAPES - Round ducts - Rectangular ducts - Results shown in inches WHO IT IS FOR - HVAC engineers and designers checking a duct size during design work. - Installation technicians and contractors who need a quick answer on site. - Students learning how airflow, velocity and duct size relate. WHERE IT HELPS - Sizing a new supply or return run from a known CFM. - Checking whether an existing duct keeps velocity within your target. - Comparing a round duct with a rectangular one when space is tight. SIMPLE BY DESIGN A clean interface with only the inputs you need, so you get an answer quickly on the job. Duct Calculator is free to use. An optional one-time upgrade removes ads. Results are intended as a calculation aid. Always confirm designs against applicable codes and project requirements. Download Duct Calculator and size your next duct run. Privacy Policy : https://semiconhub.in/manager/privacy.html Terms and Condition : https://semiconhub.in/manager/tcondition.html
Screenshots
Verdict
The clearest difference is in-app purchases: SOi Digital at none against Duct Calculator's 1. SOi Digital also leads on iOS requirement (13.0 vs 15.6). Duct Calculator's advantage is update cadence (every 10 months vs every 40 months) and device support. On price there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Duct Calculator sells 1 one-off in-app purchase. SOi Digital asks for nothing beyond the download.
SOi Digital ships an update every 40 months, Duct Calculator every 10 months. The most recent releases landed on November 3, 2026 and November 1, 2026 respectively.
| Parameter | SOi Digital | Duct Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.7 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 40 months | Every 10 months — better |
| Ads | — | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | — | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 18 MB | 44 MB |
| Age rating | 17+ | 4+ |
| Developer | Vevi Systems, S.L. | Sachinbhai Surani |
In-app purchases
SOi Digital
No in-app purchases
Duct Calculator
- Lifetime premium$9.99
Questions
Is SOi Digital free?
Is Duct Calculator free?
Which is updated more often, SOi Digital or Duct Calculator?
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